Sprinkler



v Nov. 2 1926.

' 1,605,325 c. A. BORGESON SPRINKLER Filed 001;. 15, 1925 iNVENTOR. (man-4300000 Patented Nov. 2, 1926.

UNITED STATES (III-JLARJIEIS A. BORGESON, OF SAN FRANCISCO, CALIFORNIA.

SPRINKLER.

Application filed October 15, 1923. Serial No. 668,749.

The present invention relates to improvements in sprinklers, such as are commonly used for watering lawns or flower beds or the like, the particular object being to provide a sprinkler that will evenly distribute water in a fine spray over an extended area in such a manner that each part of the area receives the same amount of water.

The sprinkler described in the present application is an improvement on the sprinkler patented by me in United States Patent No. 975,321, and offers several advantages over the latter sprinkler. One of the advantages of the present sprinkler that it throws the water in a long, low arc distinguished from the patented sprinkler, which throws the water upward to a considerable height, thereby exposing the line spray to the wind so that a large part is carried away when the wind is rather strong. A further advantage in the construction of the present sprinkler is that it is manufactured more easily, and particularly that it can be manufactured with greater accuracy. )Vith my old sprinkler I found that after manufacturing a number of the same, part of them would be defective and would have to be discarded or taken back and exchanged after having been sold, which of course increased the price of the sprinkler. The present sprinklers can be readily constructed so that each of them is perfect. Further objects and advantages of my sprinkler will appear as the specification proceeds.

The preferred form of my sprinkler is illustrated. in the accompanying drawing, in which Figure 1 shows a top plan view of the same; Figure 2 a vertical section taken along line II-II of Figure 1; Figure 3 a bottom plan view of the sprinkler detached from its base; Figure 4 a vertical. section taken along line IVIV of Figure 3.

My sprinkler (1) comprises a casting (2) adapted to be secured on a flat base (3) by any suitable" means, as by the bolts (4). The base rests on runners (5) on which the same may be slid back and forth in a well known manner. The casting (2) has a flat bottom (8) and is preferably formed in the shape of a frustrumof a cone with a flange (6) surrounding its lower end adapted to engage the base (3).

In the bottom of the casting is provided a spiral groove (7) terminating at its outer end in a pipe connection (8) provided on the outside of the casting, and terminating at its inner end in a central chamber (9). The spiral grooves 7 and the chamber 9 may be regarded as concentrically disposed passages communicating with each other. It will be noted from Figure 4 particularly that the groove decreases in depth as it approaches the center, :and that it is provided with a curved roof (10).

In the center of the casting .is provided an axial perforation (11) allowing water to pass therethrough. The lower face .of the casting leading up to the perforation is curved outwardly along radial lines as shown at (12) in Figure 2. 'The upper face of the frustrum is made funnel-shaped so that the upper face ascends in all directions from the perforation (11). It should be noted that this face is also curved outwardly along radial lines, as shown at (13).

The connection (8) is threaded as shown at (14) so that it may be readily attached to a. garden hose or the like.

In operation, when the connection (8) is attached to a garden hose the water enters the spiral groove and is given a rotary motion. After reaching the center, the water passes through the perforation (11) while retaining its rotary motion. It is then guided along the upper face of the casting and thrown outwardly in a fine spray so as to thoroughly cover a certain area of ground surface. I have found by experience that the water is very evenly distributed over the area, and that the ground surface within a few inches of the sprinkler receives the same quantity of water as that portion near the circumference of the area served. This seems to be particularly due to the fact that there is a slight curvature in the guiding faces of the sprinkler which causes part of the waterto follow the curves and to drop in the immediate vicinity of the sprinkler, as will be readily understood from a close study of the outlines (12) and (13) in Figure 2.

It will be particularly seen from said figure that if the line (13) were a straight line, the water would be forced outwardly along a straight line and would be thrown through a considerable distance before any of it would reach the surface to be watered. The form selected for the line (13) allows the water, or a portion of the same, to as sume a curved path of travel immediately upon leaving the perforation (11), and allows it to reach the ground surface much sooner.

The influence of the curvature on the spray as a whole will be that the water is thrown less high, and over a larger area, since all the Water assumes a curved path while still in contact with the sprinkler. I find from practical experience. that there is an actual difference of about five feet in the heightof the water column of my old and my new sprinkler.

I claim:

1. A lawn sprinkler comprising a base and a casing-the said casing being arranged uprightand rigidly secured to the base and having an inlet opening and further having a circular top plate provided with a cen trally disposed outlet opening, the said top plate having its upper surface sloped upwardly and outwardly at all points and along curved lines which extend continuously from the edge of the opening to the upper edge of the side wall of the casing, the interior of said casing being formed with concentrically disposed passages communicating one with the other, the inner Oil said passages being disposed concentrically with the outlet opening and having a greater area than the said opening and arranged in unobstructed communication therewith, the central portion of said inner passage immediately surrounding the outlet opening being constricted for the purpose described.

A lawn sprinkler comprising a base and a casing, the said casing being arranged upright and rigidly secured to the base and having an inlet opening and further having a circular top plate provided with a centrally disposed outlet opening,the saidtop plate having its upper surfacesloped upwardly and out wardly at all points and along curved lines which extend continuously from the edge of the opening to the upper edge of the side wall of the casing, the interior of said casing being formed with concentrically disposed passages communicating one with the other, the inner of said passages being relatively constricted and disposed concentrically with the outlet opening and having a greater area than the said opening, the said inner passage being in unobstructed communication with the outlet opening and having its central portion immediately surrounding the outletopening constricted with respect to the portion thereof adjacent the outer of said passages tor the purpose describedv CHARLES A. BORGESON. 

